constructible — adjective a) That can be constructed in a plane using only a pair of compasses and a straightedge. b) That the line segment joining it to the origin can be constructed using only a pair of compasses and a straightedge … Wiktionary

Constructible number — For numbers constructible in the sense of set theory, see Constructible universe. A point in the Euclidean plane is a constructible point if, given a fixed coordinate system (or a fixed line segment of unit length), the point can be constructed… … Wikipedia

Constructible function — In complexity theory, a time constructible function is a function f from natural numbers to natural numbers with the property that f(n) can be constructed from n by a Turing machine in the time of order f(n). The purpose of such a definition is… … Wikipedia